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X4645S8-2.7 Datasheet

  • X4645S8-2.7

  • CPU Supervisor with 64K EEPROM

  • 22頁

  • XICOR   XICOR

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Preliminary Information
64K
X4643/5
CPU Supervisor with 64K EEPROM
DESCRIPTION
8K x 8 Bit
FEATURES
鈥?Selectable watchdog timer
鈥?Low V
CC
detection and reset assertion
鈥擣our standard reset threshold voltages
鈥擜djust low V
CC
reset threshold voltage using
special programming sequence
鈥擱eset signal valid to V
CC
= 1V
鈥?Low power CMOS
鈥?lt;20碌A max standby current, watchdog on
鈥?lt;1碌A standby current, watchdog off
鈥?mA active current
鈥?64Kbits of EEPROM
鈥?4-byte page write mode
鈥擲elf-timed write cycle
鈥?ms write cycle time (typical)
鈥?Built-in inadvertent write protection
鈥擯ower-up/power-down protection circuitry
鈥?400kHz 2-wire interface
鈥?2.7V to 5.5V power supply operation
鈥?Available packages
鈥?-lead SOIC
鈥?-lead TSSOP
The X4643/5 combines four popular functions, Power-on
Reset Control, Watchdog Timer, Supply Voltage
Supervision, and Serial EEPROM Memory in one
package. This combination lowers system cost,
reduces board space requirements, and increases reli-
ability.
Applying power to the device activates the power on
reset circuit which holds RESET/RESET active for a
period of time. This allows the power supply and oscilla-
tor to stabilize before the processor can execute code.
The Watchdog Timer provides an independent protection
mechanism for microcontrollers. When the microcon-
troller fails to restart a timer within a selectable time out
interval, the device activates the RESET/RESET signal.
The user selects the interval from three preset values.
Once selected, the interval does not change, even after
cycling the power.
The device鈥檚 low V
CC
detection circuitry protects the
user鈥檚 system from low voltage conditions, resetting the
system when V
CC
falls below the set minimum V
CC
trip
point. RESET/RESET is asserted until V
CC
returns to
proper operating level and stabilizes. Four industry
BLOCK DIAGRAM
Watchdog Transition
Detector
WP
Data
Register
Command
Decode &
Control
Logic
V
CC
Threshold
Reset Logic
Block Lock Control
Protect Logic
Status
Register
EEPROM Array
RESET (X4643/5)
RESET (X4645)
Watchdog
Timer Reset
SDA
SCL
S0
S1
Reset &
Watchdog
Timebase
8Kbit
V
CC
V
TRIP
+
-
Power on and
Low Voltage
Reset
Generation
REV 1.26 4/30/02
www.xicor.com
Characteristics subject to change without notice.
1 of 22

X4645S8-2.7 產(chǎn)品屬性

  • 200

  • 集成電路 (IC)

  • PMIC - 監(jiān)控器

  • -

  • 簡單復位/加電復位

  • 1

  • 開路漏極或開路集電極

  • 高有效

  • 最小為 100 ms

  • 2.62V

  • 0°C ~ 70°C

  • 表面貼裝

  • 8-SOIC（0.154"，3.90mm 寬）

  • 8-SO

  • 管件

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